EN 3813:2013

Overview

EN 3813:2013 (CEN) specifies requirements for the aerospace series titanium alloy TI‑P64001 (Ti‑6Al‑4V) in the annealed condition, supplied as bar and wire for forged fasteners with external diameter De ≤ 50 mm. It defines chemical limits, delivery condition (annealed), mechanical property minima, heat treatment references, microstructure and inspection requirements tailored for aerospace fastener production and procurement.

Key topics and technical requirements

• Material designation: Titanium alloy Ti‑6Al‑4V (TI‑P64001).
• Forms covered: Wrought bar and wire intended for warm forging of fasteners; maximum diameter De ≤ 50 mm.
• Chemical composition: Specified limits for major alloying elements and interstitials (e.g., Al ≈ 5.50–6.75%, V ≈ 3.50–4.50%) and controls on O, N, H, Fe, C and other impurities as given in the standard.
• Delivery condition: Annealed - heat treatment specified as 700 °C to 790 °C for 1–2 hours, air cooled or in inert atmosphere.
• Reference heat treatment: 930–960 °C, ≥30 min, quenched in agitated water; recommended follow-up tempering/aging in the ~460–550 °C range (4–8 h) and air cooling (see standard for exact guidance).
• Mechanical properties: Minimum proof stress (Rp0.2), tensile strength (Rm), elongation (A) and reduction of area (Z) are specified; values vary with product diameter (De) and are given in the standard (examples: Rm ≥ 930 MPa for some sizes, elongation A ≥ 8%).
• Microstructure and inspection: Microstructure acceptance criteria referenced to EN 3114‑002; ultrasonic inspection acceptance per EN 4050‑004 (Class 5). External/internal defect limits, surface contamination, marking and dimensional inspection are referenced to EN 4800 series.
• Product qualification: Qualification programme to be agreed between manufacturer and purchaser.

Applications and who uses this standard

• Primary use: Specification for bars and wires used to manufacture forged aerospace fasteners (bolts, studs, rivets, etc.) where high strength-to-weight and fatigue performance are required.
• Users: Aerospace OEMs, fastener manufacturers, metallurgical suppliers, quality assurance and procurement teams, certification bodies and design engineers specifying material and inspection criteria.
• Practical value: Ensures consistent chemical, mechanical and metallurgical quality for Ti‑6Al‑4V feedstock, enabling reliable forging, predictable mechanical performance and traceable inspections for safety‑critical aerospace components.

Related standards

• EN 4800‑002 / EN 4800‑004 (technical specifications for bar and wire)
• EN 3114‑002 (microstructure test method)
• EN 4050‑004 (ultrasonic inspection acceptance)
• EN 4258, EN 4500‑004, EN 2032‑2 (series organization and coding)

Keywords: EN 3813, Ti‑6Al‑4V, TI‑P64001, titanium alloy, annealed bar and wire, forged fasteners, aerospace materials, CEN standard, mechanical properties, heat treatment, ultrasonic inspection.